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Another woman commented: "No way has it been marinated. It's not cooked you can see it just from the photo.

"You should have made the manager eat it there and then."

One Facebook user said they had received "disgraceful" service.

She said: "Last time I went in was early last year and it was disgraceful it needs shutting down."

The mum's Facebook post about the chicken went viral (Image: Hull Daily Mail / MEN Media)

However, one person claimed they believed the redness was caused by the spices used on the chicken, which in turn stains the meat.

They said: "It's the spices they use it stains the meats. When lower quality chicken is used there tends to be blood within the bones which absorbs into the meat."

Someone else said: "Looks fine to me and looks cooked. The reason this happens is probably down to the youngness of the chickens they use.

KFC offered her a free meal (Image: REUTERS)

"Young chickens have thin and brittle bones and as such myoglobin leaks into the chicken and cartilage and looks red. It's fine."

A KFC spokesman said: "We know it doesn't look great, but this is actually a natural colouration caused by the bone, rather than being undercooked. This can sometimes happen when dealing with fresh chicken.

"It's not harmful but we are sorry for this woman's experience and she's more than welcome to a free meal on us next time she visits."